20-12-16 in what appears to be Swingtime configuration. Sizes aren't odd at all, since this is the catalog Swingtime sizes in the 64 catalog that is price listed. Serials put you at the beginning of the Beavertail era, 1963, the missing lugs .... probably broken by some hamfisted disassembler. Heavy Beavertails would be suitable for replacement. Or go with some of the New ones.

Hey Jim
Nice Kit !
No worries on the buy more with a pile still to go after. I have been piling them up and the plan is to spend my days once I retire fixing them up. I still go after about 1 snare every 2-3 weeks, but at this rate, I will have to live to a very old age to get all of them done . . . No complaints here !
Michael

Hey Jim
Nice Kit !
No worries on the buy more with a pile still to go after. I have been piling them up and the plan is to spend my days once I retire fixing them up. I still go after about 1 snare every 2-3 weeks, but at this rate, I will have to live to a very old age to get all of them done . . . No complaints here !
Michael